Some standard content:
UDC636.485 (512.21)）
National Standard of the People's Republic of China
GB 8476-87
Hubei white pig
Published on 1987-12-26
Published by the State Bureau of Standards
Implemented on 1988-07-01
National Standard of the People's Republic of China
Hubei white pig
Hubei white pig
This standard applies to the variety identification and breeding pig evaluation of Hubei white pig. 1 Breed characteristics
UDC636.485
GB 8476-87
Hubei white pig is a pork-type breed with high lean meat rate, good meat quality, fast growth and development, excellent reproductive performance, and the ability to tolerate the high temperature in summer and the cold and wet climate in winter in the middle reaches of the Yangtze River. Originated in Hubei, it is mainly distributed in the central China region and is an excellent female parent for hybridization.
1.1 Breed structure
Hubei White Pig includes five unrelated strains, which have both common characteristics and their own characteristics. Among them, I, II, and III strains have high fertility and good adaptability; IV and V strains grow and develop quickly and have a high lean meat rate. 1.2 Body shape and appearance
Hubei White Pig has a full white coat (a few dark spots are allowed at the corners of the eyes and the base of the tail), a slightly light, straight and long head, and two ears tilted forward or slightly drooping; the back and waist are straight, the middle drive is long, the abdomen is small, the legs and buttocks are plump; the limbs and hooves are strong; there are more than 12 effective nipples. The weight of an adult boar is 250-300kg, and that of a sow is 200-250kg.
1.3 Production performance
1.3.1 Growth and fattening performance,
6-month-old reserve boars weigh 90kg, ultrasonic live body measurement of back paw thickness is 0.9~1.0cm, and ruler-thorn back paw thickness is 1.6~2.2cm. 6-month-old reserve sows weigh 82~85kg, ultrasonic live body measurement of back floating thickness is 1.0~1.2cm, and ruler-thorn back thickness is 1.7~2.5cm. The average daily weight gain of fattening pigs in the 25-90kg stage is 600-650g, and the feed utilization efficiency is below 3.5. The weight of 90kg is reached at 180 days of age. 1.3.2 Lying body quality
The average back thickness is 2.5~2.8cm, the eye muscle area is 30~34cm2, the leg-hip ratio is 30%~33%, and the lean meat yield per pig is 35~38kg. The lean meat rate of I, II, and III lines is more than 58%, and that of IV and V lines is more than 61%. 1.3.3. Muscle quality
The meat quality is good, the meat color is bright red, the meat color reflectance value is 18~21, the pH value is 6.16.4, the water content is 80%~90%, and the muscle fat content is 2%~3%.
Reproductive performance
The average age of the first estrus of sows is 121~130 days, the estrus lasts for 5~6 days, the suitable first mating period is 7~8 months, the average number of piglets born by primiparous sows is 9.5~10.5, and that of multiparous sows is more than 12. 1.4 Hybridization Utilization Effect
The hybridization with Hubei White Pig as the mother and Duroc and Hampshire Pig has good compatibility, especially with Duroc Pig. The first-generation fattening pigs of Duroc×Hampshire hybrids have a daily weight gain of 650-750g at the 20-90kg stage, a heterosis rate of about 10%, a feed utilization efficiency of 3.1-3.3, and a lean meat rate of more than 62%.
2 Evaluation of Breeding Pigs
Evaluation is carried out at three stages of 2 months, 6 months and 12-24 months. 2.1 Necessary Conditions for Breeding Pigs
Breeding pigs must have the characteristics of this breed and the basic requirements of each growth and development stage. Those who do not meet any of the following conditions are not included in the evaluation and grading scope approved by the Ministry of Agriculture, Animal Husbandry and Fisheries of the People's Republic of China on December 12, 1987 and implemented on July 1, 1988.
GB 8476-87
a. The coat is completely white, and a small amount of dark spots are allowed at the corners of the sow's eyes and the root of the tail; b. The ears are tilted forward or slightly drooping, with a lean pig body structure, no convex back and concave buttocks, plump legs and buttocks, no obvious wrinkles on the side of the body, strong limbs and hooves, and a strong physique;
The reproductive organs are normally developed, with more than 12 effective nipples; c.
d. There are no genetic diseases in the sow itself and in the same litter; the blood relationship is clear and it is a purebred pig.
2.2 Comprehensive evaluation standards for breeding pigs
2.2.1 Evaluation of 2-month-old breeding piglets
2-month-old piglets must be the offspring of the mating of the first and second-level boars and the third-level or above sows that have passed the evaluation, and they themselves meet the necessary conditions for breeding pigs. In this stage, the evaluation and grading are carried out according to the weight at 2 months of age (see Table 1). Table 1
2.2.2 Evaluation of 6-month-old reserve breeding pigs
6 months is the main stage of breeding pig evaluation. The individuals to be evaluated must be breeding pigs that have passed the 2-month-old evaluation. The average daily weight gain and live back thickness of 2-6 months old are the main evaluation indicators, with scores of 30 and 70 points (see Table 2 and Table 3). The daily weight gain of breeding piglets from 2 to 6 months old and the live back thickness score of 6-month-old reserve breeding pigs are added together to get the comprehensive score of the breeding pigs at 6 months old. 90 points or more are grade one, 75 points or more are grade two, 60 points or more are grade three, and those below 60 points are graded as inferior, the same below. Table 2
Standard, g
Standard, g
Note: Based on the lower limit of the standard, for every increase of 10 grams, 0.6 points will be added to grade one, 0.8 points to grade two, and 1 point to grade three.
Standard, g
I, I, III
IV, V
Measurement method
Ultrasonic
Ultrasonic
Standard, cm
GB8476-87
Standard, cmwww.bzxz.net
Standard, cm
Note: Based on the lower limit of the standard, for every 0.06cm reduction in back waist thickness of I, II, III series, and every 0.04cm reduction in IV and V series, 2.2 points are added for the third level.
Add 1.4 points for the first level, and 2.0 points for the second level
2.2.312-24 month old breeding pigs assessment
The breeding pigs are assessed after they have their own breeding results at 12 months old. The individuals to be assessed must be breeding pigs that have passed the 6-month-old assessment and are above the third level. The number of piglets born and the litter weight of piglets at 60 days old are the assessment indicators. Those who have reproductive organ diseases and are repeatedly infertile or have genetic diseases in their offspring will not participate in the assessment of this stage and should be eliminated (Table 4). Table 4
Number of piglets born
Litter weight of piglets at 60 days old
Number of piglets born
Litter weight of piglets at 60 days old
Note: ① For every additional piglet born by a sow, 3 points will be added to the first level, 4 points to the second level, and 5 points to the third level. ② For every 1 kg increase in the litter weight of piglets at 60 days old, 1 point will be added to the first level, 2 points to the second level, and 1.5 points to the third level. The sum of the scores of the above two indicators is the comprehensive score of the reproductive performance of sows aged 12 to 24 months. III
GB8476—87
2.2.412-24 months old breeding pigs are not subject to growth and development measurement, so the comprehensive score and grade of the breeding boar at 6 months old is the final grade; for breeding sows, the total score of (6-month-old comprehensive score × 0.6) plus (12-24 months old comprehensive score × 0.4) is the comprehensive score of the breeding sow. 90 points or more is the first grade, 75 points or more is the second grade, and 60 points or more is the third grade. 2.3 Breeding pig comprehensive index method evaluation standard
This evaluation can be carried out at three stages: 2 months old, 6 months old and 12-24 months old, but the above comprehensive scoring method is still used at 2 months old and 12-24 months old.
2.3.1 The comprehensive selection index method is mainly used for the evaluation of breeding pigs at 6 months old. Only those who meet the necessary conditions for breeding pigs can participate in the index evaluation. The comprehensive selection index is composed of two indicators: daily weight gain and live back thickness at 2 to 6 months of age. The comprehensive selection index formula is: I=22.22DGr-77.78BFr+155.56DGr is the daily weight gain ratio at 2 to 6 months of age.
BFr is the live back thickness ratio.
Index above 120 is level one, 110 to 119 is level two, and 90 to 100 is level three. 3 Standards for the emergence of breeding pigs
3.1 Breeding boars above level two and breeding sows above level three. 3.2 Strong limbs and hooves, healthy and immunized. 3.3 There is a breeding pig emergence certificate.
GB8476-87
Appendix A
Instructions for use
(Supplement)
A.1 The feeding level of this standard is based on the relevant national "Standards for the Breeding of Lean Meat Pigs". A.2 All performance indicators shall be measured according to the methods specified in the relevant national standards. The live measurement shall be carried out when the sow is 6 months old. The ultrasonic and needle measuring parts of the back are 4 cm away from the back line at the junction of the thoracic and lumbar vertebrae. The live measurement should be held in a standing position, and the measurement part should be sheared and disinfected. If an ultrasonic measuring instrument is used, light oil must be applied to the measurement part, and the probe must be kept in vertical and natural close contact with the skin. A.3 The back thickness of the live body must be the back thickness calibrated to the standard weight. A.4 The comprehensive selection index in this standard is applicable to breeding core group pig farms and purebred breeding farms with conditions. In the comprehensive selection index formula, DGr is the average daily weight gain ratio, with a weight of 0.3 and a heritability of 0.3; BFr is the live back flank thickness ratio, with a weight of 0.7 and a heritability of 0.45. Pig
Date of birth
Number of piglets in the same litter
Date of release
Date of birth
Number of piglets in the same litter
Date of release
Vaccination
Health condition
Purchasing unit
Issuing unit
GB8476—87
Appendix B
Stub of Hubei White Pig Breeding Pig Release Certificate
(Supplement)
Lineage and group
Birth weight, kg
Release weight, kg
Certificate of Hubei White Pig Breeding Pig Release
Lineage and group
Birth weight, kg Weight, kg
Weight at the exit, kg
Parathritis
Issuer
Grandfather number
Grandmother number
Weight at 60 days old, kg
Evaluation grade
Purchasing unit
Issuer
Weight at 60 days old, kg
Evaluation grade
Grandfather number
Grandmother number
Purchaser
Issuing date
GB8476-87
Additional remarks:
This standard was drafted by the Animal Husbandry and Veterinary Department of Huazhong Agricultural University and the Animal Husbandry Institute of Hubei Academy of Agricultural Sciences. The drafters of this standard are Xiong Yuanzhu, Deng Changyan and Chen Tingji. Chinese
National Standard
GB8476—87
Published by China Standards Press
(Beijing Fuwai Sanlihe)
Printed by Beijing Printing House of China Standards Press Distributed by Beijing Distribution Office of Xinhua Bookstore Sold by Xinhua Bookstores in various places Copyright is exclusive and no reproduction is allowed
Format 880×12301/16·Printing Sheet 3/4
Number of Words 13000
First Edition in May 1988
First Printing in May 1988
Printing Quantity 1-1500
Book Number: 155066·1-5567
Heading 90—25
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